PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

How is stabilizer trim adjusted?

1. By a manual lever

2. By an electrically driven jack screw

3. By hydraulic pressure

4. By a mechanical linkage

The correct answer is: By an electrically driven jack screw

The adjustment of stabilizer trim in the Canadair Regional Jet Systems (CRJ) is done effectively through an electrically driven jack screw. This system allows for precise changes to the stabilizer angle, enabling better control and performance of the aircraft during different phases of flight. The electrically driven nature of this mechanism ensures that adjustments can be made swiftly and reliably in response to pilot inputs. While other methods of trim adjustment exist in aviation, the use of an electrically driven jack screw is particularly advantageous for modern aircraft like the CRJ, as it provides enhanced accuracy and reduces the physical effort required by the pilots to maintain optimal trim settings. Mechanical linkages could indeed be used for trim adjustments in some older or different aircraft designs, but in the CRJ, the electrically driven system represents a more advanced and preferred method. This system not only improves the responsiveness of the trim but also contributes to the overall efficiency and aerodynamic performance of the aircraft, particularly in complex flight scenarios where fine adjustments to the stabilizer are needed.